SIEMENS
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Siemens D 21.4 · 2017
Safety Integrated
Safety Integrated
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Function
Safe Brake Control (SBC)
The SBC function permits the safe control of a holding brake.
SBC is always activated in parallel with STO.
Effect
A holding brake which is active in a de-energized state is con-
trolled and monitored using safe two-channel technology. Due to
the two-channel control, the brake may still be activated in the
event of an insulation fault in the control cable. Errors of this kind
are detected early by means of test pulses.
Note:
Safe Brake Control does not detect mechanical faults in the brake
itself, such as worn brake linings. For Motor Modules in booksize
format, the terminals for the motor brake are integrated. An addi-
tional Safe Brake Relay is required for Power Modules in blocksize
format. An additional Safe Brake Adapter is necessary for Power
Modules in chassis format.
Application
The SBC function is used in conjunction with the functions STO
or SS1 to prevent the movement of an axis in the torque-free
state, e.g. because of gravity.
Customer benefits
Again, the function saves the use of external hardware and the
associated wiring.
Safe Brake Test (SBT)
The SBT diagnostic function carries out a brake function test at
regular intervals or before personnel enter the danger zone.
Effect
A good way to check the proper functioning of brakes that have
become worn is to apply a torque to the closed brake. Drive
systems that have two brakes, e.g. motor brake and external
brake, can be tested with different torque values.
Application
The SBT diagnostic function is suitable for implementing a safe
brake in combination with the SBC function.
Customer benefits
The function detects faults or wear in the brake mechanics.
Automatically testing the effectiveness of brakes reduces
maintenance costs and increases the safety and availability
of the machine or plant.
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G_D211_XX_00276
STO
SBC
G_D211_XX_00311
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SBT
© Siemens AG 2017